Improvement in scroll-sawing machines



E. ANDERSON.

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UNITED STATES EUCLID ANDERSON, 0E

PEEKSKILL, NEW YORK.

IMPROVEMENT IN SCROLL-SAWING MACHINES.

Specification forming part of Letters Patent No. [8 1,762,

dated September 5,1876; application filed January 17, 1876.

To all whom it may concern:

Be it known that I, EUCLID ANDERSON, of Beekskill, in the county of Westchester and State of New York, have invented an Improvement in Scroll-Sawing Machines, of which the following is a specification:

This invention relates to that class of sawing-machines used mainly by amateurs for scoll and other delicate kinds of sawing, and designed mainly to be operated by foot-power,

though not necessarily so.

The object of this invention is-to dispense with the generally-used means ofimparting reciprocating motion to the saw, and to substitute a movement that shall be simpler, cheaper, and more effectual; and this object is attained by using a polygonal cam to oscillate the saw-frame, which movement also secures other advantages, as by it the friction is reduced and less power is required to do a given amount of work; and as it gives a positive movement to the down or cutting stroke of the saw, metal even may with facility be sawed, and such a cam also prevents the machine stopping on a dead-center.

, 1n the drawings attached, Figure 1 is a perspective view of a machine embodying my invention. Fig. 2 is a plan, showing the essential parts in a clearer manner.

In Fig. 1, A is the table or top of the machine, which may be supported on three or B B B is the saw-frame, which is attached to the table by and swings on the pivot b. The saw is strained between the extremities of the arms B B, in the manner common to saws of this class. Theshort arm B is an extension of the saw-frame, and carries at its extremity the roller 0. D is a cam, preferably of six sides, as shown, against which theroller O is caused to press by the spring f, so that when the cam D is rotated the saw-frame is caused to vibrate and give a proper motion to the saw. The curves of the circumference of the cam are so made as to give a motion to the saw similar to that derived from the crank. The cam D is carried 1 on the end (in this instance) of a short shaft, that has a bearing in the piece E, which may be a part of the leg or frame of the machine. To the other end of the shaft is attached the fly-wheel H, which gives steadiness of motion to the whole, though the cam and fly-wheel may be cast together; or the cam itself may be made heavy enough to answer the purpose of a fly-wheel.

The cam may be of any number of sides; but six is preferable, as it gives a sufficient speed to the saw without a rapid movement of the foot, and answers best for keeping the treadle off of the dead-center when the machine is at rest. The pressure of the spring fon the roller causes the cam to stop'with the roller in the most depressed part of one of the sides, and as the crank-pin e is placed with reference to this position of the cam, it follows that it will not stop on the center.

The tension of the spring fis regulated by the screw and nut h g, Fig. 1.

F is the treadle, and c is the pitman, through which motion is communicated to the machine.

I do not claim as new the application of a cam 'to a saw; neither do I claim the sawl'rame swinging on a pivot at or near the surface of the table, have been in use for years; but my method of arranging and using said devices produces a more simple,easy-working, and perfect sawing-machine for small scroll-work than has heretofore been shown.

1 claim as my invention 1. The saw-frame B B, having projecting arm B, roller (J, spring f, and cam D, combined and operating substantially as described.

2. In combination, the cam D, arm B, spring f, crank-pin e, pitmau e, and treadle F, arranged and operating substantially as and for the purpose hereinbefore set forth.

EUCLID ANDERSON.

Witnesses STEPHEN LEN D. W. TRAVIS.

as I am aware that both 

